Forward reach over an obstruction (counter, base cabinet): 15-48" AFF with knee space below
HUD FHA Design Manual Ch 5 §5.6 Forward reach over an obstructionDescription
Controls and outlets may sit above an obstruction (built-in shelves, countertops) and still be accessible. The reach range is 15-48" AFF, and a 30"-wide knee space as deep as the reach distance — adjoining a 36"-wide accessible route — must be provided below the obstruction so a wheelchair user can pull up and execute the reach.
Why this exists
Kitchen counter outlets (the GFCI receptacles above backsplashes) typically fall here — reachable from a forward approach only if there's open knee space below. A toe-kicked base cabinet doesn't satisfy the rule; you need a sink, dishwasher, or specifically left-open knee compartment.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
kneeSpaceWidth | min | 30 | in | Knee space width below obstruction |
Categories
Source
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Universal-design wider doorways · HUD UD §3.2
- Universal design features encouraged for residential accessibility under Section R320.3 · Virginia USBC 2021 Amendment 33 (IRC R320.3)
- Covered multifamily dwellings: at least one building entrance on an accessible route · HUD FHA Design Manual Requirement 1 (Chapter One)
- Public and common use areas must be readily accessible to and usable by people with disabilities · HUD FHA Design Manual Requirement 2 (Chapter Two)
- All doors must provide a clear opening of at least 32 inches when open 90 degrees · HUD FHA Design Manual Requirement 3 (Chapter Three)
Last reviewed 2026-05-14.